AdventOfCode2021/day2.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AdventOfCode2021
{
    internal class day2
    {
        string[] input;

        public day2(string day)
        {
            input = getInput(day);
            part1();
            part2();
        }
        public string[] getInput(string day)
        {
            string filepath = $"../../../inputs/{day}.txt";
            string[] file = File.ReadAllLines(filepath);

            return file;
        }


        public void part1()
        {
            int result = 0;
            int horizontal = 0;
            int depth = 0;

            foreach(string line in input)
            {
                if (line.StartsWith("forward"))
                {
                    horizontal += int.Parse(line.Split(' ')[1]);
                }
                else if (line.StartsWith("down"))
                {
                    depth += int.Parse(line.Split(' ')[1]);
                }
                else if (line.StartsWith("up"))
                {
                    depth -= int.Parse(line.Split(' ')[1]);
                }
            }
            result = horizontal * depth;
            Console.WriteLine($"Part 1: {result}");
            
        }
        public void part2()
        {
            int result = 0;
            int horizontal = 0;
            int aim = 0;
            int depht = 0;
            foreach (string line in input)
            {
                if (line.StartsWith("forward"))
                {
                    horizontal += int.Parse(line.Split(' ')[1]);
                    depht += int.Parse(line.Split(' ')[1]) * aim;
                }
                else if (line.StartsWith("down"))
                {
                    aim += int.Parse(line.Split(' ')[1]);
                }
                else if (line.StartsWith("up"))
                {
                    aim -= int.Parse(line.Split(' ')[1]);
                }
            }
            result = horizontal * depht;
            Console.WriteLine($"Part 2: {result}");
        }
    }
}